Centering and cementing device



Sept. 4, 1923. 1,466,986

J. P. BURGHER CENTERING AND CEMENTING DEVICE Filed June 19. 1922Patented Sept. 4, 1923.

UNITED STATES" JOHN P. BUBGHER, OF LONG BEACH, CALIFORNIA.

CENTEBING AND CEHENTING DEVICE.

Application med June 19, 1922. Serial No. 589,520.

To all 'whom it may convent:

Be it known that I, JOHN P. BURGHER, a citizen of the United States, andresident of Long Beach in the county of Los Angeles and State ofCalifornia, have invented certain new and useful Improvements inCentering and Cementin Devices, of which the following is a s ci cation,

In drilling o1 gas and similar wells it is fre uently necessary to passthrough strata om which water flows into the well, and it is necessaryin some manner to stop this iow of water. This has been frequently doneb inserting a stopper of cement, and then rillin through the cement tocontinue the we to a greater depth.

An object of my invention is to provide a device that willfacilitatethis operation and enable such cementing to be done accurately andeicientl Another oliject is to provide a device which will insure thecement being properly centered so that it will contact with the walls ofthe bore on all sides.

A further object is to provide a device that will be left in the boreand with the cement will form a reinforced device similar to reinforcedconcrete.

Other objects will be apparent from the followin .detailed descriptionand the appended c aims.

In the drawings:

Figure 1 is a lon itudinal section showin the bore of a wel with thedevice placed in position preparatory to supplying cement thereto. A

Figure 2 is a similar view on an enlarged scale showing the cementforced into position.

Fi ure 3 is a perspective view of the packing evice.

The bore A of the well is shown as passing through the usual strata Binto a stratum C through which water may fiow into the well bore. Adevice D, shown in Figure 3, has two hollow cylindrical end portions 1and 2 connected by outwardly bowed spring strips 3. The end portions aremade somewhat smaller than the bore or casing of the well, and thespring portions 3 should be bowed suiiiciently to come in contact withthe walls of the bore A. The strips 3 may be fastened to the endportions in any desired manner.

The upper cylindrical end rtion 1 is reamed to the desired size wh1 ethe lower portion 2 isprovided with internal screw threads 4. A hollowpipe 5 provided with a threaded lower end 6 is employed for placing thedevice D in position. The device D is screwed upon the lower end of theipe l5 as shown in Figure 2 and lowered to t e desired position.

Cement is then forced through the pipe 5 under pressure in any old ordesired manner. After the proper amount has been supplied it will benoted by reference to Figure 2 that cement has been forced out` of thebottom of the cylindrical portion 2 and forms a plug 7. It has alsobeen-forced from the bottom up through the openings between the bowedportions 3 and around the outside 4of the cylindrical portions 1 and 2as shown at 8 and 9. The bowed sprin portions 3 are imbedded in a hollowcylin er 10 of cement whose internal diameteris that of the end portion1 and external diameter'is that of the bore A of the well.

If the well is to be bored deeper, the plug 7 of cement will -be drilledthrough and the bore extended to the desired depth. In case the desiredbottom has been already reached, the device will form a bottom plugobviating the necessity for any further provision for closing the bottomof the bore.D

The bowed spring portions not only' form with the cement a reinforcedcylindeii; but when the device D is first placed in position, theseportions will center the device and insure a uniform thickness of cementon all sides of the central bore.

The size and proportions of the device D regarded as limited only byscope of the appended claims.

I claim as my invention:

1. A cementing device for wells comprising hollow cylindrical endportions, and outwardly bowed spring metal strips connecting the same.

2. A cementing device for wells comprising hollow cylindrical endportions the lower of which is provided with internal screw threads,outwardly bowed spring metal strips connecting the same, and apositioning device engaging the threaded portion.

3. A cementing device for wells comprising hollow cylindrical endportions 0f smaller diameter than the bore of the well, 'and outwardlybowed sprin 'metal strips contacting with the bore of t e .well tocenter the device.

4. A cementing device for wells comprising hollow cylndrical endportons, out# y' lower of which is internally screw threaded,

outwardly bowed spring metal stripsl connecting the same, and a conduitmember fitting within the end portions and engaging said screw threadedportion, thus serving as Leccese a. means to position the device cementthereto 6. A plug device for wells comprising hollow cylindrical endportions, outwardly bowed spring metal strips connecting the same, and acement casing for the whole.

7. A plug device for wells comprising hollow cylindrical end portions,outwardly 25 bowed metal strips connecting the same, and a cement casingforming a plug for the lower end portion, surrounding the end portions,and having the bowed strips embedded therein.

In testimony whereof, l have hereunto subscribed my name JOHN P.BURGHEB.

and supply

